Trimming mechanism for sewing-machines.



A. RONTKE.

TR|MMING MECHANISM FOR SEWING MACHI NES. APPLICATION mm MAR.II.19!5.

1,200.989. Patented Oct. 10, 1916.

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'A. RONTKE.

TRIMMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR. 11, 1915.

1,200,989. Patented Oct. 10,1916

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A. 'RONTKE.

TRIMMING MECHANISM FOR SEWING MACHINES. APPLICATION FILED MAR. 11. 1915.

Patented Oct. 10, 1916.

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ED sTArns PATENT ornron. Y

ALBERT RONTKE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE SINGER, MANU- FAC'IURING COMPANY, A CORPORATION OF NEW JERSEY. i

TRIMMING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Oct. 10, 1916.

8 Application filed March 11, 1915. Serial No. 13,576.

To all whom it may concern:

Be it known that I, ALBERT RoN'rKE, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Trimming Mechanisms for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying e drawings.

This invention relates to improvements in seam-trimmers for sewing machines and has for its object to. provide a construction and arrangement of coacting cutting elements better adapted to the requirements of seam and edge trimming, together with improved means for actuating the trimming element and for controlling its action and inaction at the will of the operator, and to effect this the trimmer element comprises an open ring in which one or both of the walls of said opening comprise cutting members, said ring being mountedto oscillate in a guide ring having an opening one of thewalls of which comprise a ledger-blade, the trimmerring being operatively connectedwith the actuating mechanism of the sewing machine through a chain of connections including coacting elements capable of manual control during the seam formation, to effect or discontinue the trimming operation.

Referring to thedrawings whiclrform a part of the specification, Figure 1 is a front side elevation of a sewing machine equipped with the present invention; Fig. 2a front plate beingremoved to better illustrate certain of the elements, later to be referred to, important to the means for actuating. the present stitch-forming and cloth-feeding mechanism; Fig. 3 a plan view of the front end portion of the sewing machine bed-plate shown in the previous figures; Fig. 4: a view in elevation of the present improved trimming mechanism corresponding to that of Fig. 3, detached from the sewing machine, the trimmer-ring, its bracket and retaining plate being shown in section; Fig. 5 an elevation, partly in full lines and partly in 50 section, of the elements comprising the chain of connections arranged betweenv the trimmer ring and its operating eccentric carried by the main-shaft looking in the direction indicated by the arrow X, Fig. 4; Figs. 6, 7,

8 and 9, side and edgeviews'of the trimmer end elevationrof Fig. 1, the bracket-arm facering bracket, trimmer ring, trimmer guide ring and trimmer ring retaining plate re-'" spectively.

The present invention is herein shown and will be described in connection with one'variety of Singer universal feed sewing machine, substantially the same as is represented by United States Patent No. 989,538, of April 11, 1911, to A. Rontke, andonly such reference will be made to the well known parts herein illustrated as is deemed sufficient for a proper understanding of its appiication. I

Referring to the figures, 1 represents the. sewing machine bed-plate upon which is mounted the bracket armfcomprising the standard 2 and arm bracket 3, 4 the main or needle-bar actuating shaft provided at its rear end withthe band wheel 5 and at its opposite end with the shaft flange 6, 7 the needle thread take-up operated from the main-shaft in a manner common to the present machine, 8 the spring depressed clothpresser carrying bar provided at its lower end with a cloth-presser 9 and 10 the needlethread tension device. i 5.

' 11 represents an oscillatory feed actuating frame mounted upon oppositely arranged pintle bearings comprising the stud 12. threaded into the armbracket and pin 13 secured by screw lfi: in the arm 15 of the oscillating frame, the tapered portion 16 of the pin entering an opening 17 of like shape in the bed-plate 1, said framebeing opera-. tively connected with the main shaft 1 by pin 18, eccentric strap 19 and eccentric 20', the latter secured to the side of the belt pulley 21, as in Patent No. 989,538 previously referred to. y

22 denotes a belt for transmitting, through the pulleys 21 and 23, rotary movements to the looper actuating shaft 24 carrying the loop-taker 25.

26 represents the needle-bar operatively connected with the main-shaft through the stud collar 27 and link, 28, thelatter journaled at its upper end on a stud 29 (shown in dotted lines only, Fig. 3) rigidly secured in the flange 6, said needle-bar being mounted to move vertically in suitable hearings in the lugs 30 and 31 formed integral with the arm 32 of the frame 11. I 4 v I 33 denotes the step feeding foot carrying bar 'mounted to move vertically in suitable bearings formed in the lugs 30 and 31 and otally attached to ita link 35 whose oppoat its lower end provided with a feeding foot 34, the upper end of the bar 33 having pivsite end is pivotallyiconnected with an arm 36 of a bell crank lever 37 pivoted 38 to the. presser bar lifting lug 39 carried by the presser-bar, the arm 40 of the lever 37 being pivotally. connected to one end of the link 41 whose opposite end is pivotally con: nected to crank-arm 42 forming an integral part of the stud 29. 48 denotes afeed-dog carried by the free endcof the arm 15 of the 7 frame 11, said feed-dog having movements in a single plane only corresponding sub- 'sta'ntially to the upper surface of the needle or throat-plate 44.

In thefeeding operation the rotary movements of'thecrank-42 about the axis of the V main-shaft effect through theli'nk 41 rock- 'ing movements of the bell crank lever 37,

' which latter through the link efiects vertic-alimovements of the step feeding foot .carryingbar'33 when the cloth-presser, is

seated; upon the fabric, but'at such time as ,the step feeding foot" 34 is in engagement with the fabric the crank 42, through the connections. 41, 37 and 35, act toraise the presser-bar off the fabric, the vertical movements of the latter alternating with those .ofthe step feeding foot carrying bar to release the fabric during the feeding OPGIZltlOII.

and" to hold the fabric against accidental movement when theneedle 46 and feeding foot are out of engagement with the fabric, or at such time as the needle and feeding foot are being returned to their positions an'dthle latter in the bearing mer'guide frame, said trimmer and guide for effecting the next subsequent feed movement, as in the construction representedby the patent previously referred to. It being understood that the stitch-forming and cloth-feeding mechanisms may be as herein pointed out or of any other known and,

approved construction.

Referring now to the features in construction more directly connected with the invention, 47 represents a trimmer frame comprising bracket 48 and integrally formed trimmer a trimmer frame securing guide" frame 49, said trimmer frame being adjustably, secured on the bed-plate 1 by denotes an" open trimmer ring the walls 52and 53 OfWlllCl'l' comprise trimmer blades, said trimmer ring being mounted to oscillatein anopen guide ring 54 the wall 55 of which compr ses a'ledger blade, said trimmer ring being mounted in the guide ring in the 1'11111-' ring being heldagainst displacement by a retaining cap 56 secured by'screws, as 57 passing through the openings, as 58, formed in the guide ring 54 and'threaded into the openings, at 59, in the trimmer guide 60 represents an eccentric carried by the main-shaft 4 and provided with a bearing block 61 arranged between the lugs, as. 62, formed integral with the vertically movable trimmer-actuating bar 63, the latter held against accidental displacement by the bearing plate 64 secured by screws, as 65, threaded into thearm-bracket 3, the lower portion .of the bar 63 .being provided with a groove 66 in which is mounted to move endwise a link-bar 67 carrying a latch 68 hinged on the pivot pin 69 and resiliently held by spring 70 against movement except through the manual manipulation of the finger-p ece? 1.

72 denotes a latch.bracketadjustably se cured by screws, as 73,.to the rear side of the bar 63, as viewed in Fig. 3, and provided' with a catch or retainer. in the form of a slot 7.4 to receive thetongue 75'of the latch 68, best shown in Fig. 5.

' 76 denotes a trimmer-actuating link pro videdat-its lower end with a stud 77 ei'itering an opening 78 in the trimmer ring 51,

its opposite end being provided. withlleg's 79 and 8 O'into which is threaded a stud screw 81 provided with a knurled head 82, said stud-screw passing through an open ing 83 formed in the lower end of the linkbar 67, thus operatively connecting the eccentric I 68' withthe trimmer ring 51, the stud screw 81 being of sufficient length to permit .tacting with the lower end of the slot 84 formed in the rear side ofthe trimmer guard frame 49, thus discontinuing the trimming operation, which latter is resumed by moving the elements 67 and 7 6'upward a distance sufficient to place the tongue 75 into engagement with the slot 74 by an upward pressure of the finger on the head 82 of the stud-screw 81. As the trimmed ofi' portions leave the cutting members they are directed through the opening 85 in the bedplate. 1, .the oval portion 86 of the trimmer guide frame 49 and the retaining' 'cap 5 secured to the. rear side of said frame acting as a chute to direct said trimmed off portion below the bed-plate and out of range of the loop-taker and its actuating shaft. The binder-head 87 is included in the drawings for an understanding of a product requi'r.

ing

the present relative arran ement! of" needle and trimmer-blade.

Having thus set forth the nature of the invention, what I claim herein is 1. In a seam-trimmer for sewing machines, the combination with a stitch-formin mechanismand means for-presenting a fa%ric to the action of the latter, of a circular guide-frame supporting a ledger-blade, a trimmer-blade mounted to oscillate about the axis of said guide-frame, and connections for operatively connecting said trimmer-blade with the actuating mechanism of the sewing machine.

2. In a seam-trimmer for sewing machines, the combination with a stitch-form'- in mechanism and means for presenting a fabric to the action of the latter, of a circular guide-frame supporting a ledger-blade, a trimmer-blade mounted to oscillate about the axis of said guide-frame, and connections for operatively connecting said trimmer-blade with the actuating mechanism of the sewing machine, said connections including means efiective, at the will of the operator, to place into or out of action said trimmer-blade.

3. In a seam-trimmer for sewing machines, the combination with a stitch-forming mechanism and means for presenting a fabric to the action of the latter, of a circular guide-frame provided with a guide-ring having a ledger-blade, a trimmer-ring mounted to oscillate in said guide-ring and provided with a trimmer-blade, and connections for operatively connecting said trimmer-ring with the actuating mechanism of the sewing machine.

4. In a seam-trimmer for sewing machines, the combination with a stitch-forming mechanism and means for presenting a fabric to the action of the latter, of a circular guide-frame provided with a guide-ring having a ledger-blade, a trimmer-ring mounted to oscillate in said guide-ring and provided with a trimmer-blade, and connections for operatively connecting said trimmer-ring with the actuating mechanism of the sewing machine, said connections including means effective, at the will of the operator. to place into or out of action said trimmer-blade.

5. In a seam trimmer for sewing machines, the combination with a stitch-forniing mechanism and means for presenting a fabric to the action of the latter, of a circular guide-frame supporting a ledgerblade, a trimmer-blade mounted to oscillate about the axis of said guide-frame, and connections for operatively connecting said trimmer-blade with the actuating mechanism of the sewing machine, said connections including means effective, at the will of the operator, to place into or out of action said trimmer-blade, and means for registering said trimmer-blade out of its field of effective action when disconnected from the sewing machine actuating mecha nism.

6. In a seam trimmer for sewing machines, the combination with means for presenting a fabric to the action of a stitchforming mechanism, of a circularguideframe supporting a ledger-blade, a trimmerblade mounted to oscillate about the axis of said guide-frame, and connections for operatively connecting said trimmer-blade with the actuating mechanism of the sewing machine including an eccentric, a trimmer-actuating bar, a trimmer-actuating link, a latch and latch retainer, said latch capable of manual adjustment, during the stitching operation, to effect or discontinue the triniming operation.

7. In a seam trimmer for sewing machines, the combination with a sewing machine bed-plate, a stitch-forming mechanism and means for presenting a fabric to the latter, of a circular trimmer guide-frame suspended in an opening in said bed-plate and provided with coacting cutting elements, means for actuating one of said elements and a retaining plate for holding said cutting elements against accidental dis placement,the opening in said bed-plate acting, in connection with said trimmer guideframe and retaining plate,as a chute to direct the trimmed oif portion of the fabric below the bed-plate.

8. In a seam trimmer for sewing machines, the combination with a stitch-forming mechanism and means for presenting a fabric to the action of the latter, of a trimmer-frame comprising a trimmer guide frame and securing bracket, said guideframe provided with a circular bearing into which is mounted a guide-ring provided with a ledger-blade, a trimmer-ring provided with a trimmer-blade mounted to oscillate in said guide-ring, a retaining plate for holding said trimmer-ring against accidental displacement, and connections for operatively connecting said trimmer-ring with the actuating mechanism of the sewing machine.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALBERT RONTKE.

Vitnesses:

FRANK M. WOOTTON, EDWARD H. WOODS.

Copies of this uatent may be obtained for five cents each, by addressing the Commissioner of Patento, Washington, D. G. 

